Dangerous and complicated... Three rotors and four engines... Wow.
You have to wait for the turbofans (might be small turboshafts) to stop turning before you egress the aircraft, or that would be one hell of a dangerous egress. God forbid if you trip...
Does not seem practical to me. Speed increase is nice, I'm sure, whatever it may be... But huge increase in fuel consumption, maintenance, consumables, etc. Would this be worth a small range and speed increase?
-Skater
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